Text completer is still the most apt allegory. If you ask it to open a file and do something with it, often it wont open the file and just text complete the output. That failure mode never happens in any sort of human, it just happens because its a text completer.

Many people hate when you don't anthropomorphize LLM though, but that is the best way to understand how they can fail so spectacularly in ways we would never expect a human to fail.